[Martin Bush]

It's an Arcam, so a transistor amp.

I don't plan to do much more than have one pair of speakers on or the other. But something tells me I need to find out whether switching between the two while the amp is running is safe.

I am thinking of a situation where I may have a piece of music playing and want to see out of curiosity how it sounds on the other set of speakers - temptation would be to flick over and not pause the music, turn the amp off etc.